What happens if a sample tests positive for Total or Fecal Coliform?

In accordance with the Total Coliform Rule, if any routine sample tests Total Coliform positive, it must be analyzed for Fecal Coliform. 

If any sample is found to be Total Coliform positive, the water system must collect a set of repeat samples for each positive sample. The repeat samples confirm the presence of Total Coliform bacteria in the distribution system. 

A sample must be collected from the sampling station that had the initial positive sample and samples must also be collected from locations upstream and downstream of that sampling station. In most cases these upstream and downstream locations are kitchen or bathroom faucets in homes or businesses located around the sampling stations.

Show All Answers

1. Total Coliform and Fecal Coliform: what’s the difference?
2. Where are the water supply samples taken from?
3. How are water supply quality samples analyzed?
4. What happens if a sample tests positive for Total or Fecal Coliform?
5. What amount of Total Coliform indicates a water system violation?
6. What if Fecal Coliform is detected in a routine sample?